[1] It was originally published in the Spring 1968 issue of Ubris magazine, and collected in King's Skeleton Crew in 1985.
It deals with a depressed and homicidal college student, Curt Garrish, who goes on a murderous sniper rampage from his dormitory room.
He talks to a couple of his fellow students and the dorm's RA who tells him to fill out a damage form.
After talking to another student named Bailey, who takes the nude model pinups from over Piggy's bed, Garrish relates the story of Cain and Abel, then opens a window and begins to hunt for targets outside.
[2] The short story was adapted once again in 2022 by Miguel Alejandro Marquez, with actor Steven Braunstein starring as Curt.